/**
 * @Author：JIAMIN_TANG
 * @Description:
 * @CreateTime：2025/9/24 18:25
 */
class B{
    public int Func(){
        System.out.print("B");
        return 0;
    }
}

class D extends B{
    @Override
    public int Func(){
        System.out.print("D");
        return 0;
    }
}

public class Test {
    public static void main(String[] args){
        B a = new B();
        B b = new D();
        a.Func();
        b.Func();
    }
}
